Grease-gun.



o. A. WILSON.

GREASE GUN.

APPLICATION FILED J NE 24, 1910.

Patented Apr.4, 1911.

I/VVEIVTOR BY t Arron/v5):

CLARENCE WILSON, OF PASSAIC, NEW JERSEY.

GREASE-GUN.

Specification of Letters Patent.

Application filed June 24, 1910. Serial No. 568,613.

To all whom it may concern:

' Be it known that IJCLARENCE A. WILSON,

citizen of the United States of America, residing at Passaic, New Jersey, have invented certain new and useful Improvements in Grease-Guns, of which the following is aspecification.

This invention relates to hand oilers, and has as an object the provision of a device particularly adapted to feeding thick, pasty materials, as heavy lubricating grease.

' In order to overcome the resistance incident to the feeding of such material, I provide a screw for controlling the piston, and to move the piston more quickly when the resistance is less, there is means for throwing the screw thread out of engagement so that direct pressure may be applied to the piston rod, and it may be moved freely back and forth in its bearing. Such means for con necting and disconnecting the screw is a feature of my invention.

-When the cylinder is full of grease, the piston rod, if in place, would extend for the greater portion of its length beyond the cylinder head, so for convenience I make it removable. As the piston is screw controlled, and it is desirable to rotate the rod to operate the screw, the rod should have a swivel connection with the piston, and such swivel connection, and means whereby the rod is conveniently attached to and detached from the piston without opening the cylinder to obtain access to the piston, is another feature of my invention. L

In the preferred form of my grease gun, thereis a' cylinder and piston and a-piston rod. The latter is screw threaded and has a V sliding bearing in the cylinder head. There.

' 'moving this member back and forth so that its thread is thrown into and out of engagement with the thread on the rod. The piston rod has a' swivel engagement with the piston, and in order that the rod may be eas-- ily removed, the mouth of the swivel socketis threaded, and the end of the rod, which is enlarged to engage the socket, is also threaded to cooperate with the thread inthe socket mouth, so that the enlarged end of the rod may be inserted in the socket bv bringing its thread into engagement with that of the socket mouth and rotating the rod till its enlarged. end moves through the socket mouth and into the chamber of the socket wherein it rotates freely. The rod may be removed by pulling it up till the threads engage and rotating it in the direction opposite to that in which it was'rotated when inserted. It will be apparent that it is immaterial which member of the swivel is attached to the piston and which to the rod.

For the purposes of illustration, a grease gun embodying the features of my invention in one form is shown in the accompanying drawings.

Figure l is a vertical central cross section through the pump cylinder taken on the plane of the line 22, Fig. 2. Fig. 2 is a view of the cylinder head detached, seen from below.

. The pump consistsof a cylinder 1, piston 2, and piston rod 3. The latter has a sliding bearing at 4 in the cylinder head, and has a thread 5 extending throughout the greater portion of its length. A block or lever 6, threaded to cooperate with the thread 5, is pivoted at 7 to the cylinder head,

and a spring 8, shown as coiled about the pivot 7 and bearing at one 'end against the cylinder wall, engages at its other extremity a pin 9 on the lever or-block 6, tending toswing the lever away from the piston rod. Adjacent the lever or block 6, which is hereafter known as a threaded member, is an eccentric or cam 10, mounted on a pivot 12,

which passes through the cylinder head, is

journaled therein and provided on its other extremity outside the cylinder with a handle 11. 1 By means of the handlell the eccentric 10 may be rotated, to force the threaded member 6, contrary to the tension of the spring, against the piston rod 3, bringing the threads 'of the former into engagement with the threads of the latter.

'der head, the spring 8 servingto maintain the threads of the member 6 out of engage- Patented Apr. 4, 1911.

ment with those of the rod, so that the pistonmay' be moved back and forth to bring it into engagement with the material to be forced out or for any other purpose, and that when great pressure is-des1red for ejecting heavy grease, the handle 11 may be rotated, bringing thethreads of the member 6 into engagement with the threads of the piston rod, and in effect converting the bearing in the cylinder head from a sliding to a screw engagement. Adjacent its end the diameter of the piston-rod is reduced, forming a shank 13 and a head or end 15.

As shown, the reduced portion is of a di-fl in a block 18, securedtothepistonproper,

and has a mouth or contracted opening 19 of less diameter than the socket proper 17 also less than the diameter of the head 15 and slightly greater than that of the shank.

- The mouth 19 is threaded to cooperate with thethreads 1a so that the head 15 may be passed through the contracted mouth 19 by rotation of the rod. The top face of the block 18 is cupped at 20, and the end of the piston rod is rounded at 21, these two features cooperating to center the rod as it is inserted. Q ,It will thus be apparent that weihave a swivel joint connecting the piston and piston rod, and that the rod and piston may be connected and disconnected at this point withoutbpening the cylinder or in any Way securmgdirect access to the piston, and the o1nt is of such nature that the piston may be advanced either by screw or directpressure of the rod, and may be retracted by dlrect tension on the rod. One side of the cylinderhis a sheath 22, in which the piston rod may be placed when not in use, and the grease gun is provided with a swinging nozzle 23 pivoted on a-hollow journal 24, which serves as a delivery passage. The passage 25 leads to a port 26, with which the nozzle 23 registers when in its lower position. WVhenno grease is beingdelivered and the grease gun is out of actibn, the nozzle is swung, about its pivot and rests against the cylinder, so that the whole device normally occupies a-very small space even when'the cylinderls full, makmga convenient grease pump and receptacle'for motor cars, etc.

embodiment of my invention in order that 1ts operation may bewellunderstoodl However, the specific terms herein are used ,in their descriptive and not in their limiting sense.

claims.

I claim- 1. In a grease gun, a cylinder, a piston,

I have thus described specifically a single The scope of my invention is defined in the a and a piston rod, the rod having a threaded end and a shank ofiless diameter than the end, the piston having a socket to receive the threaded end, the socket proper being of diameter greater than the diameter of the threaded end, the mouth of the socket being contracted to a diameter less than that of the threaded end and threaded to engage it so the end of the rod may be'passed through the contracted month by cooperation of the threads and seated in the socket.

2. In a grease gun, a cylinder, a piston, and a piston rod, the rod having a threaded portion' near its extremity and a port-ion of less diameter than the threaded portion adjacent the latter but nearer the center of the rod, the piston having a socket concentric with the cylinder axis, the socket being of greater diameter than the outside of the thread, and having an opening to admit the end of the piston rod, the mouth of the socket being contracted to a diameter less than that of the socket proper and threaded to cooperate with the threads on the end of thepiston rod.

3. In a grease gun, a cylinder, apiston, a threaded piston rod, a threaded member movably mounted on the cylinder, and means for moving it to cause its threads to engage and disengage the threads on the piston rod, the latter having a threaded eX- tremity and a portion of less diameter than the threaded extremity adjacent the latter and nearer the middle of the rod, the piston having a socket the mouth of which is con tracted and threaded, the threads of the socket corresponding to thethreads on the end of the piston rod.

4. In combination a cylinder having a head a screw-threaded piston rod the screw-thread being omitted from a portion of the rod a short distance from the end, the cylinder head being apertured for the 'free passage of the rod; a member secured to the cylinder York this 23d day of June 1910.

CLARENCE A. WILSON.

Witnesses:

EVAN L. TAMBLYN, CHARLES D. EDWARDS. 

